<template>
    <div>
          <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>


    <!-- 卡片视图区 -->
    <el-card>
          <!-- 2.为ECharts准备一个具备大小（宽高）的Dom -->
    <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
    </div>
</template>


<script>

// 1.导入echarts
import echarts from 'echarts'

import _ from 'lodash'


export default {
    data() {
        return{
            // 需要合并的数据
            options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
        }
    },
    created() {
        
    },
    // 此时， 页面上的元素， 已经被渲染完毕了
    async mounted() {
          //3. 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'));

        const {data: res} = await this.$http.get('reports/type/1')

        if(res.meta.status !== 200) {
            return this.$message.error('获取折线图数据失败')
        }

        // 4.准备数据和配置项

        const result = _.merge(res.data, this.options)
        
        // 5.展示数据
        myChart.setOption(result)
    },
    methods: {
        
    },
}
</script>


<style lang="less" scoped>

</style>